Počet záznamů: 1
Micromechanisms and Micromechanics of Fracture of TiAl Intermetallics
- 1.
SYSNO ASEP 0326071 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Micromechanisms and Micromechanics of Fracture of TiAl Intermetallics Tvůrce(i) Dlouhý, Ivo (UFM-A) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCID
Hadraba, Hynek (UFM-A) RID, ORCID
Krahula, Karel (UFM-A)Zdroj.dok. Metallofizika I Noveishie Tekhnologii - ISSN 1024-1809
Roč. 31, č. 1 (2009), s. 81-96Poč.str. 16 s. Jazyk dok. eng - angličtina Země vyd. UA - Ukrajina Klíč. slova fracture toughness ; micromechanisms of fracture ; dhear ligament toughening ; TiAl ; intermetallics Vědní obor RIV JG - Hutnictví, kovové materiály CEP GA106/07/0762 GA ČR - Grantová agentura ČR GD106/05/H008 GA ČR - Grantová agentura ČR CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000266834200005 Anotace The paper is focused on the analysis of the role of microstructure in fracture performance of TiAl intermetalics at room and elevated temperatures. Tensile properties, flexural strength and fracture toughness have been evaluated for Ti-40Al-2Cr-2Nb-1B and Ti-46Al-0,7Cr-0,1Si-7Nb-0,2Ni alloys. Positive Nb effect on fracture resistance was found; fracture toughness of the high Nb alloy was increased at contemporary increase of tensile and flexural strength. Fracture surfaces were evaluated using scanning electron microscopy showing the key role of mechanical twinning in deformation of both alloys. As a governing mechanism of the crack initiation a microcrack nucleation at boundaries between deformation twins and -TiAl grains was confirmed. Extensive development of shear ligament toughening was observed supplying quite good fracture toughness values in high Nb alloy. Based on findings obtained key aspects of the effect of separate microstructural components have been discussed. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2010
Počet záznamů: 1